When should the AGSM be initiated to be fully effective?

Initiating the Anti-G Straining Maneuver (AGSM) prior to G onset is critical for maximizing its effectiveness. The purpose of the AGSM is to counteract the physiological effects of increased gravitational forces during maneuvers in aviation, which can lead to G-induced loss of consciousness (GLOC). By beginning the maneuver before the onset of G forces, pilots are able to prepare their bodies to maintain blood flow to the brain, thus improving their ability to withstand increased G loads effectively.

When initiated ahead of G onset, the AGSM allows the pilot to tighten their core muscles, perform the appropriate breathing techniques, and adjust for the impending G forces, thereby enhancing overall tolerance. If the maneuver is not initiated until after G forces have begun to act on the body, its effectiveness is diminished, as the body may already be experiencing the adverse physiological effects of G-loading. This proactive approach is essential to ensure pilots can remain conscious and functional throughout challenging flight conditions.